Reticulofenestra haqii


Classification: Coccolithophores -> Isochrysidales -> Noelaerhabdaceae -> Reticulofenestra -> R. pseudoumbilicus group -> Reticulofenestra haqii
Sister taxa: R. calicis, R. pseudoumbilicus, R. haqii, R. minuta, R. minutula, R. asanoi, R. kahniae, R. rotaria, R. pospichalii,

Distinguishing features: Coccoliths small (3-5µm), intergrades with R. pseudoumbilicus.


Taxonomy:

Citation: Reticulofenestra haqii Backman, 1978
Rank: Species
Variants:

Farinacci & Howe catalog pages: Reticulofenestra haqii * Reticulofenestra lingfengensis *

Distinguishing features: Coccoliths small (3-5µm), intergrades with R. pseudoumbilicus.

Search data:
TagsLITHS: placolith, elliptical, CA: grill, vacant,
CSPH: spherical, monomorphic, V-UNITS: none, R-UNITS: all, c-str, distal shield, prox shield, tube, DETAILS: ca_conjunct, isogyres kinked, isogyres oblique, rim-unicyclic,
MetricsLith size: 3->5µm;
Sources:
The morphological data given here can be used on the advanced search page. See also these notes

Geological Range:
Last occurrence (top): within NN15 zone (3.70-3.92Ma, top in Zanclean stage). Data source: Young 1998
First occurrence (base): within NN2 zone (19.00-22.82Ma, base in Aquitanian stage). Data source: Young 1998

Plot of occurrence data:

  • Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
  • Taxon plotted: Reticulofenestra haqii, synonyms included - Dictyococcites haqii; Reticulofenestra haqii; Reticulofenestra pseudoumbilicus var. haqii; space-time plot :: Samples map :: Parent: R. pseudoumbilicus group

    References:

    Backman, J., (1978). Late Miocene - Early Pliocene nannofossil biochronology and biogeography in the Vera Basin, SE Spain. Stockholm Contributions in Geology, 32: 93-114.GS

    Wang, C. & Huang, W., (1989). Calcareous nannofossils., Cenozoic Paleobiota of the Continental Shelf of the East China Sea (Donghai). Micropaleobotanical Vol. Geol. Pub. House, Beijing, pp. 202-252.GS

    Young, J.R., (1998). Neogene. In: Bown, P.R. (Editor), Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publications Series. Chapman & Hall, London, pp. 225-265.GS

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    Reticulofenestra haqii compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 24-2-2019

    Taxon Search:
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    Short stable page link: http://mikrotax.org/Nannotax3/index.php?id=1164 Go to Archive.is to create a permanent copy of this page - citation notes
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    Comments (1)

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    Ines Galovic (CGS, Croatia)
    It is clear on the holotype figures of both R. haqii and R minutula species (dimension around 4 µm and almoust the same number of elements) that R. haqii has smaller opening (around 1 µm) than minutula (around 2 µm) . Your figures of birefringence and last SEM here mostly are not presented by typical figures of haqii origin. Could you please give us (Paratethian workers who are not dealing with younger sediments) more information why you put this species in hagii?
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    Jeremy Young (UCL, UK)
    Reticulofenestra taxonomy is, of course, problematic and difficult to standardise. My approach in the Neogene is to use coccolith size and shape but not central area opening size. Hence for me all the illustrated forms fall in R. haqii.
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